Chooooo choooo! The Hogwarts Express has arrived at last (or has it???). Either way, you're almost to Hogwarts, so get off the train and get going to the school!
First years, follow the groundskeeper to the lake. Second years and up, go for the horseless (thestral-led) carriages. Don't forget anything on the train, because you won't see it for another 9 months!